University of Groningen

Brilliant camouflageWilts, Bodo D.; Michielsen, Kristel; Kuipers, Jeroen; de Raedt, Hans; Stavenga, Doekele

Published in:Proceedings of the Royal Society of London. Series B, Biological Sciences

DOI:10.1098/rspb.2011.2651

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Publication date:2012

Link to publication in University of Groningen/UMCG research database

Citation for published version (APA):Wilts, B. D., Michielsen, K., Kuipers, J., Raedt, H. D., & Stavenga, D. G. (2012). Brilliant camouflage:photonic crystals in the diamond weevil, Entimus imperialis. Proceedings of the Royal Society of London.Series B, Biological Sciences, 279(1738), 2524-2530. DOI: 10.1098/rspb.2011.2651

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Supplementary Material

Fig. S1. Scanning electron microscopy of single scales of E. imperialis. (a) A single, intact scale.

The upper side of the scale consists of a set of more or less parallel furrows (scale bar: 20 µm).

(b) SEM image of a cross-section showing tilted sheets with hexagonal symmetry (c.f. Fig. 2b;

scale bar: 2 µm).

Fig. S2. Imaging scatterometry with a narrow beam illumination of ~5° angular width. The

reflecting scattering pattern of a green (a) and an orange domain (b) has identical angular width,

corresponding to a near-ideal point spread function. The white-dashed circles indicate scattering

angles of 5°, 30°, 60° and 90°.

Fig. S3. Simulated scatterograms of (a) a simple primitive, (b) a diamond and (c) a gyroid PC,

oriented in (0 0 1) direction. The scatterograms are scaled so that the highest wavelength is 600

nm. The scatterograms are distinctly different in shape and spectral composition.

Fig. S4. Simulated photonic band structure diagram for a single-network diamond-type photonic

crystal (D surface, Fd3m) with a dielectric constant ε = 2.45 and a filling fraction of ~30 %

(t = -0.5) for the lowest six energy bands. The high symmetry points are given in canonical order.

Fig. S5. Refractive index dependency of the complete photonic band gap based on the single-

network diamond BPC with t = -0.5. The complete photonic band gap opens at n’/n ~ 2 (black

arrowhead). The inset indicates the position and the width of the bandgap.